How do I factory reset my Galaxy Centura?

I have a Galaxy Centura that my bf gave me. He however had put a lock on it and can't remember what it is so that I can unlock it and begin using it. I've been trying to do a factory reset but it won't work. I'm holding the volume up & down buttons & the power button at the same time, but the factory reset screen never appears. It doesn't do anything but turn phone on. Can anybody help me? I'm going crazy here!!

From power off, Volume Up + Home, then press the power button. Hold all 3 until you see the tiny blue writing at the upper left of the screen (I forget what it says - recovery mode, maybe). There's a Factory reset item in there. Volume up and down buttons to move between items, power to do the current item.

That probably won't remove the screen lock, though. (And for obvious reasons - people "finding" phones and asking how to unlock the screen - we won't give that information out here.) Either ask him for the password (or pin code or pattern) or, as Belodion said, bring the phone to the carrier's store and they can unlock the screen for you.

Then change it to something you can't forget. (And that no one else can figure out, like your birthday or house address.)